<!DOCTYPE html>
<html lang="zh-CN">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .box {
      width: 300px;
      height: 300px;
      background-color: skyblue;
      border-radius: 50px;
      border-radius: 10px 50px;
      border-radius: 5px 30px 60px;
      border-radius: 5px 20px 50px 80px;
    }
  </style>
</head>
<body>
  <div class="box"></div>
</body>
</html>